Author Topic: back spacing (Read 3304 times)

scott · « **on:** March 14, 2011, 09:22:50 pm »

i have a 70 coupe and want to put 17x8s on rear shod with 245x50 and 17x7 225x50 on front will i need 4.5 or 4.75 inch back space also it will be 1inch lowered front and rear:feedback:

BLKPNY · « **Reply #1 on:** March 14, 2011, 10:36:08 pm »

We have 17x8 rims for Mustangs from 64-73, why do you want skinner rims on the front? Why not 8's all round?

blackthunder1970 · « **Reply #2 on:** March 15, 2011, 07:08:55 am »

hi scott
use 4 and half back space
i am with blkpny use 8s all way around
you can fit 265 on the back
barry

LEE H 69 · « **Reply #3 on:** March 15, 2011, 07:12:02 am »

I have 18x8 on the back of mine with 245x45 with a 4.5 backspace, and lowered 2 inches, had to roll the guards to stop the rubbing.

Frank70 · « **Reply #4 on:** March 15, 2011, 12:56:20 pm »

Running 15x10s with 275s lowered with no rubbing.

I think my backspacing is somewhere between 4.5 to 5 - never actually measured it.

Cheers,
Frank.

scott · « **Reply #5 on:** March 15, 2011, 03:54:24 pm »

no particular reason for the different sizes 17s should fit under without rubbing shouldnt they

philb · « **Reply #6 on:** March 15, 2011, 06:34:28 pm »

Just to be a party pooper, legally you should have the same width rim front and rear.

scott · « **Reply #7 on:** March 15, 2011, 07:27:16 pm »

and legally your not supposed to widen your tracking more than an inch either or so ive heard

BLKPNY · « **Reply #8 on:** March 15, 2011, 07:52:05 pm »

I don't think that is correct Phil, a lot of cars come with different size wheels front & rear, VE HSV's, just about any euro sports car, to name a couple.

Frank70 · « **Reply #9 on:** March 16, 2011, 07:07:02 am »

+1 on BLKPNYs reply - my M3 has 'staggered' rims - wider on the rear.
Just about all Porsches have them , other BMWs, HSVs etc.

Cheers,
Frank.

philb · « **Reply #10 on:** March 16, 2011, 09:29:29 am »

Yes sorry, its fine if the car came with staggered sizes from factory, but the stangs I believe didn't. I went down this road a few weeks ago after being told by the licensing guys that the rim sizes needed to be as factory and asked if the rims were staggered on mustangs and they weren't, as mine has 7's F and 8's rear.
Basically do what you can get away with and keep a spare set of rims for going over the pits when you get caught!
Its easier to ask for forgiveness than for permission:smile01:

BLKPNY · « **Reply #11 on:** March 16, 2011, 04:56:17 pm »

I've passed many RWC's with 6's or 7's on the front, and 8' on the back. in fact my rims on my 66 when I bought it, for it's first RW and Vic Roads inspection, were 6's & 185's on the front, and 8's & 235's on the rear.

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Author Topic: back spacing (Read 3304 times)